Symptom

You are not able to post the payment allocation due to error message Payment Allocation Missing.

Reproducing the Issue

Go to the Payment Management work center, and select the Payment Allocations view.

Show all In Preparation allocations, and select the one in question.

Edit the Payment Allocation and allocation is complete, and you could see that the open amount is zero.

Choose the Post button.

You get the error message payment allocation missing.

Cause

Although an appropriate customer / supplier was selected and stored, the error message suggests that an assignment subject is missing.Such error occurs due to buffering problem and most the time it is a temporary issue.

Resolution

Assuming this as temporary problem,please proceed as follows:

Go to the Payment Management work center, and select the Payment Allocations view.